Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-6 == 39*x+8
algebra.equations.linear.balance.con-left-minus, term=8
-14 == 39*x
algebra.equations.linear.balance.scale-to-one, factor=39
-14/39 == x
algebra.equations.linear.flip
x == -14/39